Subject to the limitations contained in this section, the governing body of a local government may provide such covenants as it may deem necessary to secure the payment of the principal of and interest on revenue bonds, and premium on revenue bonds, if any. Such covenants may include, but are not limited to, depositing certain revenues into a special fund or funds as provided in subsection (3) of this section; establishing, maintaining, and collecting fees, rates, charges, tariffs, or rentals, on facilities and services, the income of which is pledged for the payment of such bonds; operating, maintaining, managing, accounting, and auditing the local government; appointing trustees, depositaries, and paying agents; and any and all matters of like or different character, which affect the security or protection of the revenue bonds.
The proportion or fixed amount of revenue so obligated shall be a lien and charge against these revenues, subject only to maintenance and operating expenses. The governing body shall have due regard for the cost of maintenance and operation of the public utility, system, improvement, project, facility, addition, or extension that generates revenues obligated to be placed into the special fund or funds from which the revenue bonds are payable, and shall not set aside into the special fund or funds a greater amount or proportion of the revenues that in its judgment will be available over and above such cost of maintenance and operation and the proportion or fixed amount, if any, of the revenue so previously pledged. Other revenues, including tax revenues, lawfully available for maintenance or operation of revenue generating facilities may be used for maintenance and operation purposes even though the facilities are acquired, constructed, expanded, replaced, or repaired with moneys arising from the sale of revenue bonds. However, the use of these other revenues for maintenance and operation purposes shall not be deemed to directly or indirectly guarantee the revenue bonds or create a general obligation. The obligation to maintain and impose fees, rates, charges, tariffs, or rentals at levels sufficient to finance maintenance and operations shall remain if the other revenues available for such purposes diminish or cease.
The governing body may also provide that revenue bonds payable out of the same source or sources of revenue may later be issued on a parity with any revenue bonds being issued and sold.
RCW 39.46.150
Funds for reserve purposes may be included in issue amount: RCW 39.44.140.